Machine fob mortising the stiles of blind-slats



` D. T. BRAKE, OF LEOMINSTER, MASSACHUSETTS.`

MACHINE FOR MORTISING!" THE STILES F BLIND-SLATS.

Specication of Letters Patent No. 17,141, dated April 28, 1857.

To all whom it may concern: l

Be it known that I, D.. T. DRAKE, of Leominster, in the county ofWorcester and State of Massachusett-s, have invented a new and ImprovedMachine for Cutting Mortises for l/Vindow-Blind Slats, of which thefollowing is a full, clear, and exact description, reference being hadto the accompanying drawings, making part of this specification, inwhich- `Figure l is aplan; Fig. 2 an end view; Fig. 3 a longitudinalvertical section on the line A,v A, of Fig. l. j

In the said drawings B is the frame of the machine, on the top of whichmoves the long carriage C, sliding back and'forth across the machine onrods or ways 2. In rectangular grooves in this carriage C (seen insection in Fig. 2) slides the second carriage E; this carriage consistsof two long bars connected together at the ends by the rods or braces Z9extending from one to the other. These bars have on their inner sidesrectangular grooves c, in which are laid the Stiles or side pieces ofthe blind which are to be mortised; these areheld firm in the grooves cby the clamps d` attached to the bar. Attached to the top of one side ofthe carriage C is a pattern rack F which is secured by screws c; thisrack has cut on its inner edge notches at the distance apart at whichthe mortises are to be cut. Attached by suitable standards to the top ofone bar of the carriage E next to the rack is a rod or spring way h onwhich slides two blocks f, g, which act as pawls to the rack F; `thesemay be adjusted at the proper place on the rod z, and be there securedby tightening a screw in each block. On a cross brace Gr ofthe frame Bare adjustable stops z' which arrest the carriage C as it is moved onits ways a and which regul late the distance which the carriage movesand consequently the depth of the mortise cut.

Pivoted at 'u to the underside of the frame B are the cutter frames Hand I which are adjusted and steadied by braces 7c leading from thelower end of each to the frame B. In the cutter frames slide gates (oneof which is seen at T Fig. 2) which carry the cutters; there gates aremoved up and down in suitable ways in their frames by the hand levers Kand L one of which is attached to straight grooves, and carries a head Min which revolve two finishing bits, driven by a band m over theirpulleys a, a guide pulley 0 being attached to theframe I. The gate ofthe frame I-I has` on its sides grooves which move on inclined ways 79in the frame (seen dotted in Fig. 3) which causes its cutter to beraised and lowered in nearly a` perpendicular line, and prevents theband g from being stretched as the gate descends; this cutter N isrevolved by the band g on a pulley r on its shaft; the bands g and m aredriven by power applied to the pulleys O.

Operation: The frames H and I are adjusted to `give the requiredinclination to the cutter N and bit head M; the stiles or side rails ofthe blind, which are to be mortised are laid in the grooves c .in thecarriage E, one on each side against the stops m at one en d of thegrooves, and are there secured by the clamps d, the carriage E is slidback toward the left on the carriage C until the place wheretheirstmortise is to be cut is opposite to the cutterN. The pawl is nowadjusted on the rod 71, opposite to the firstnotch No. l on the rack barF (the notches on which correspond with the required distance of themortises from each other). By means of the hand lever K the gate T inthe frame I is lowered until the nishing bits in the head M are belowthe plane in which the stuff operated on travels; this is done toprevent them from disfiguring the work beyond where the lirst mortise isto be made. The stops i on the cross piece G are adjusted to give theproper depth to the cut. moved on its ways a across the machine upagainst one of the stops the cutter N making a cut for the lirst mortisein one of the stiles. The carriage C is now brought back against theother stopl z' and a cut is made in the opposite stile. The carriage Eis then slid along the distance of one notch of the bar F, the spring ofthe rod it allowing the pawl f to slide and drop into the next notch,when the movements of the carriage C are repeated making a second pairof cuts; and the same is done for a third pair when the first cut willbe opposite to the bits in the head M the distance of the cutter N andbits n apart having been previously adjusted. The lever K is now raisedand the bits are brought up into line with the first cut so that thenext time the carriage C is moved up, the two bits enter one into eachThe carriage C is now `half of the stile; an omission of the cuts isthen necessary for a short distance in the middle of the length of thestile where the cross piece of blind comes. For this reason the gate ofthe frame H is lowered by the hand lever L carrying the cutter N downv fout of the way. The carriages are then moved until the bits havefinished their work in the last cut. The bit head M is then depressedout of the way, the cutter N is raised into line and the carriage E ismoved along until this cutter is opposite the place where the nextmortise is to be made below the space left for the cross bar of theblind. The pawl g is now adjusted and secured 'on the rod 71, oppositeto notch No. l of the bar F and the operation of cutting is continued asbefore the bits being again brought up into line when the next cut to befinished has come opposite to them. And when the last cut is made at thelower end of the stile the cutter N is dropped, and the bits finishtheir work, when the Stiles are removed to be replaced with others.

By the above described machine I am enabled to cut the mortises forslats of window blinds, with accuracy and despatch, the

bevel of the mortise and the distance of one mortise from the 'next one,as well as the depth of the cut being easily and nicely adjustable.

The pattern bar F may be readily replaced by others with diiercnt sizednotches to correspond with the required distances of the mortises.

WVhen thicker stuff is used for the stiles,

and longer mortises are to be cut, a larger cutter may replace the one Nand the finishing bits may be set farther apart one of them being madeadjustable in its bearings in the head M.

It' instead of the mortises, holes are to be bored in the Stiles forrevolving slats, the cutter N may be dropped out of the way, and thebits in the head M being removed, one of them may be replaced by a bitof a size suitable .for boring the holes required.

What I claim as my invention and desire to secure by Letters Patent isThe within described machine for cutting mortises for window blindslats, constructed in the manner substantially as herein set forth; andconsisting essentially in the carriages E and C in combination with thecutters N and bits n operating in the manner specified.

D. T.v DRAKE.

1Witnesses Trios. R. RoAcH, P. E. TESCHEMACHER.

